zaocans = ('baozi','youtiao','renganmian','mianwo','doupi')
for zaocan in zaocans:
    print(zaocan)

print('\n')
zaocans = ('doujiang','doufunao','renganmian','mianwo','doupi')
for zaocan in zaocans:
    print(zaocan)

requested_toppings = ['mushrooms', 'onions', 'pineapple']
if 'mushrooms' in requested_toppings:
    print('true')
print('pepperoni' in requested_toppings)


print('--------------')
requested_toppings = ['douzi']
if requested_toppings:
    for requested_topping in requested_toppings:
        print("Adding " + requested_topping + ".")
        print("\nFinished making your pizza!")
else:
    print("Are you sure you want a plain pizza?")

print('----------------------\n----------------------')
available_toppings = ['mushrooms', 'olives', 'green peppers',
                      'pepperoni', 'pineapple', 'extra cheese']
requested_toppings = ['mushrooms', 'french fries', 'extra cheese']
for requested_topping in requested_toppings:
    if requested_topping in available_toppings:
        print("Adding " + requested_topping + ".")
    else:
        print("Sorry, we don't have " + requested_topping + ".")
print("\nFinished making your pizza!")